Select the most appropriate option to substitute the highlighted segment in the given sentence. If there is no need to substitute it, select ‘No substitution’.
Don’t lose sight of your goal lest you should fail.

Correct option is B

The correct answer is (b) No substitution.

• Explanation: The phrase "lest you should fail" is correctly used in the sentence. "Lest" is an old-fashioned or formal word meaning "to avoid the risk of." In this context, it is followed by "should," which is the correct auxiliary verb to express a possibility or precautionary condition.
• Corrected Sentence: "Don’t lose sight of your goal lest you should fail."